I think I might have posted this in Bobby’s Evernote with 1 notebook post, but I have a pretty good system:
1. Outlook for Calendar & Tasks, connected with Gmail.
2. Evernote as my magic, portable reference & filing cabinet.
3. OneNote as my written-note capture and Working space (on my tablet-pc) with a GTD Notebook for current Projects.

I started to document my process here in the comments but it’s too detailed so I need to write it up properly and send it in for review.